The field-proven Hydromatic H4H Series yields the best of both worlds by providing greater efficiency and a steeper non-overloading performance while passing a full three inch spherical solid (as required by the “Ten States Standards” policy for submersible non-clog pumps) due to the enhanced geometry of the mono-vane impeller. The Hydromatic H4H Series features a smoother design, reducing the chance of possible plugging. The H4H Series yields steeper, non-overloading performance with flows up to 850 GPM and heads to 105' TDH. Available in 7.5HP through 15HP motors with speeds up to 1750RPM, the new H4H Series, encompasses a VFD (variable frequency drive) rated motor with Class H insulation. The F.M. approved, explosion-proof H4HX Series are rated Class I, Division1, Group C and/or D for hazardous locations